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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df96d88e0bb2d1ef66b05a02b351dc5629e1c9a1cdb2bfb204916772a2719e7' 
  AND token = 'PkJRmjtzQ8fgcVt4G4/t8j+OjpTkRw2pZRAvnebR+jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}